Dear sir, i have a problem. iam using sduos 7562. i tried service mode options with *#197328640# code..in that i changed some options .but i dont know what i exactly changed... now present my mobile lost wcdma signal.. i.e when my mobile is in wcdma only, it showing no service. i tried with different sim cards. i did flshing also....and when inserted some 3g sim signal is ok but when mobile is on , it automatically shut down. .. so please tecll me solution